English, asked by shikhakaur116, 11 months ago

Find the sum of the first 20 terms of the AP2+7+12+......by using formula

Answers

Answered by deepsingh28

0

Answer:

AP- 2 7 12 ......

A(first term) 2

d= 7-2=5

n=20

s20=20/2 +(2(2)+(20-1)5

= 10+23×5

= 125..

Explanation:

hope it helped.

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